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Many common medications list fatigue as a side effect — but your doctor may not have flagged it. Check your medication below and find out what to discuss with your GP.
Covers 37 common medications. Search by generic name or brand name.
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Take the fatigue quiz →Over 200 commonly prescribed medications list fatigue as a known side effect. The mechanisms vary: some act on the central nervous system directly (antihistamines, antidepressants, beta-blockers), others deplete nutrients essential for energy production (statins reduce CoQ10, metformin reduces B12), and some disrupt sleep architecture without you realising.
Medication fatigue is frequently missed because it is gradual — it builds over weeks as blood levels stabilise — and patients assume the tiredness is a separate problem rather than a side effect.
No — never stop prescribed medication without speaking to your GP first. Many medications that cause fatigue are treating conditions where stopping abruptly is dangerous. The right step is to raise it with your prescriber, who may be able to adjust the dose, change the timing, or switch you to an alternative with a better side effect profile.
Beta-blockers, antihistamines, benzodiazepines, antidepressants (particularly SSRIs and tricyclics), anticonvulsants, and some blood pressure medications are among the most common causes. Statins cause fatigue in a subset of patients, likely through CoQ10 depletion. Metformin can cause B12 deficiency over time, which presents as fatigue and brain fog.
The clearest sign is timing — did the fatigue begin or worsen after starting a new medication, or after a dose increase? If yes, there is likely a connection. Your GP can review your medication list and rule out other causes with a blood panel. Keeping a fatigue diary alongside your medication history helps identify patterns.